Group 10, Crankcase

Information 

• The main bearing screws (4WD) for the fourth main bearing (feeding through all-wheel cross tube) are shorter than those for the 2WD engine. 
• Do not confuse main bearing screws! 

Fig 1: Identifying Upper Part Of Crankcase
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1. Upper part of crankcase
2. Lid
3. Sealing ring
4. Screw plug for upper part of crankcase → Tightening torque: 30 Nm (22 ftlb.)  and → Torque angle: 60° 
5. Dowel sleeve
6. Oil spray jet
7. Screw, M6 x 16 → Tightening torque: 10 Nm (7.5 ftlb.) 

1. Direction of travel

Fig 2: Identifying Lower Part Of Crankcase V8 (2WD)
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1. Lower part of crankcase
2. Straight pin, 6 x 18
3. Sealing ring
4. Sealant application - Doboseal 224N (999.915.573.43, status 09/08)
5. Thrust-bearing screw, M11; tighten screws within 5 minutes; observe tightening sequence. → Initial tightening: 30 Nm (22 ftlb.)  → Torque angle: 90° 
6. Thrust-bearing screw, M10; tighten screws within 5 minutes; observe tightening sequence. → Initial tightening: 22 Nm (16 ftlb.)  → Torque angle: 60° 
7. Aluminum screw  , M8 x 70; (cross bolt connection); always use new aluminum screws; → Initial tightening: 10 Nm (7.5 ftlb.)  and → Final tightening: 90° 
8. Screw, M8 x 35 → Tightening torque: 23 Nm (17 ftlb.) 
9. Screw, M8 x 50 → Tightening torque: 23 Nm (17 ftlb.) 
10. Dowel sleeve

1. Direction of travel

Fig 3: Identifying Lower Part Of Crankcase V8 (4WD)
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1. Lower part of crankcase
2. Straight pin, 6 x 18
3. Dowel sleeve
4. Seal
5. Sealing flange
6. Screw, M6 x 20 → Tightening torque: 13 Nm (9.5 ftlb.) 
7. Screw, M8 x 35 → Tightening torque: 23 Nm (17 ftlb.) 
8. Screw, M8 x 50 → Tightening torque: 23 Nm (17 ftlb.) 
9. Sealing rings for sealing flange/cross tube
10. Cross tube for all-wheel drive cross shaft
11. Aluminum screw  , M8 x 70; (cross bolt connection); always use new aluminum screws; → Initial tightening: 10 Nm (7.5 ftlb.)  and → Final tightening: 90° 
12. Thrust-bearing screw, M10; tighten screws within 5 minutes; observe tightening sequence. → Initial tightening: 22 Nm (16 ftlb.)  → Torque angle: 60° 
13. Thrust-bearing screw, M11; tighten screws within 5 minutes; observe tightening sequence. → Initial tightening: 30 Nm (22 ftlb.)  → Torque angle: 90° 
14. Sealing ring

-  - Sealant application - Doboseal 224N (999.915.573.43, status 09/08)

Fig 4: Sealant Application

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1. Wipe off sealant residues after fitting

1. Direction of travel
   Fig 5: Tightening Sequence For Thrust-Bearing Screws

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1 to 20  - Tightening sequence for M11 and M10 screws => Observe different torques!

1. Direction of travel
   Fig 6: Tightening Sequence For Securing Lower Part Of Crankcase To Upper Part Of Crankcase (Cross Bolt Connection)

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Fig 7: Identifying Left Bracket For Auxiliary Units And 2WD Engine Mounting
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1. Bracket for auxiliary units
2. Screw, M10 x 45 → Tightening torque: 65 Nm (48 ftlb.) 
3. Dowel sleeve
4. Engine carrier
5. Hydraulic mount, left
6. Nut, M12 → Tightening torque: 120 Nm (89 ftlb.) 

Fig 8: Identifying Left Bracket For Auxiliary Units And 4WD Engine Mounting
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1. Bracket for auxiliary units
2. Screw, M10 x 45 → Tightening torque: 65 Nm (48 ftlb.) 
3. Dowel sleeve
4. Engine carrier/cross-shaft engine carrier
5. Hydraulic mount, left
6. Nut, M12 → Tightening torque: 120 Nm (89 ftlb.) 

Fig 9: Identifying Left Bracket For Auxiliary Units And 4WD Turbo Engine Mounting
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1. Bracket for auxiliary units
2. Screw, M10 x 45 → Tightening torque: 65 Nm (48 ftlb.) 
3. Dowel sleeve
4. Engine carrier/cross-shaft engine carrier
5. Hydraulic mount, left
6. Nut, M12 → Tightening torque: 120 Nm (89 ftlb.) 
7. Heat shield
8. Screw, M6 x 12 → Tightening torque: 13 Nm (9.5 ftlb.) 

Fig 10: Identifying Right Engine Mounting
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1. Engine carrier
2. Screw, M10 x 45 → Tightening torque: 65 Nm (48 ftlb.) 
3. Nut, M12 x 1.5 → Tightening torque: 120 Nm (84 ftlb.) 
4. Hydraulic mount, right
5. Installation view of screw-on points for engine carrier on crankcase

   For tightening specifications for the 4WD front-axle final drive  refer to → 398819 REMOVING AND INSTALLING ALL-WHEEL FINAL DRIVE

Fig 11: Identifying Oil Mist Separator
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1. Engine ventilation/oil mist separator
2. Molded seal
3. Molded seal
4. Screw elements, M6 → Tightening torque: 10 Nm (7.5 ftlb.) 

Fig 12: Identifying Ventilation, Naturally Aspirated Engines
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1. Engine ventilation line
2. Line for oil mist separator to intake-air distributor
3. Tank ventilation
4. Aluminum holder
5. Aluminum screw (holder); see Timing-case cover

Fig 13: Identifying Ventilation, Turbo Engines
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1. Engine ventilation line
2. Check valve for full-load ventilation with secured lines
3. Tank ventilation
4. Aluminum holder
5. Aluminum screw (holder); see Timing-case cover
6. Belt tensioner
7. Holder
8. Fastening screw; see Figure

Fig 14: Identifying Positive Crankcase Ventilation (PCV), Turbo
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1. Ventilation pipe with sealing ring (to lower part of crankcase)
2. Screw M6; ventilation pipe to lower part of crankcase → Tightening torque: 10 Nm (7.5 ftlb.)  and ventilation pipe to cylinder head → Tightening torque: 10 Nm (7.5 ftlb.) 

-  - Installation view of cylinder head

Fig 15: Identifying Engine Design Cover
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1. Design cover for cylinder bank 1 to 4
2. Design cover for cylinder bank 5 to 8
3. Screw; design cover to bar ignition module → Tightening torque: 4.4 Nm (3.5 ftlb.) 
4. Mounting points (rubber ball elements)